Though most of their neighbors in the Patagonian Andes are shrinking, two glaciers in Chile and Argentina, respectively, are taking on ice, puzzling scientists.

Are fathers necessary? A Himalayan culture has no fathers, except in the biological sense, and according to experts, the kids are all right.

See an ultralight hang glider fly in formation with cranes, a bright-green Chinese lake, and hundreds of thousands protesting in Iran in this week's selection of the best news pictures.

"Pregnant" seahorses, ferocious egg-carrying water bugs, and midwife monkeys—meet some of the dedicated fathers that are rarities in the animal kingdom.

With giant sperm up to ten times its body length, the male seed shrimp is the beneficiary of an evolutionary adaptation tens of millions of years in the making, a new study says.

See an E.T.-like amphibian, a prickly lizard, a katydid that sends vibrating valentines, and more—all potential new species found in remote Ecuadorian mountains.

A bug-eyed salamander and a colorful poison frog are among 12 species possibly new to science recently found in the mountains of Ecuador. Video.

Fighting off, and feeding on, rodents that would gnaw away at masterpieces, dozens of "working" cats patrol the labyrinthine storerooms of Russia's Hermitage museum. Video.

Students dance in foam, Indian asthma sufferers swallow live fish, a Japanese robot shows off its pancake-flipping prowess, and more in our editor's picks of the week's best news pictures.

Snakes use their overlapping scales to snag uneven ground and achieve their trademark slither, a new study says.

In Lithuania, eating crow isn't an exercise in public humiliation, as the English idiom suggests. Here, crow is literally eaten, and says one connoisseur, "it increases sexual potency." Video.

Codes that can't be hacked without revealing the hackers may be on the horizon, thanks to a team of Austrian physicists who sent pairs of entangled photons across long distances.

See a pie-throwing fest, a cone of water vapor around a supersonic jet, and a glacier getting a sun shield in this week's best news pictures.

Manatees can't hear the low sounds of boat engines, which is why the animals are frequently injured, a researcher says. A high-pitched alarm could solve the problem. Video.

Apes laugh too, say researchers who tickled gorillas, chimps, orangutans, bonobos, and human babies—suggesting laughter began in a prehistoric ape-human ancestor. Video.